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Dataflow: Introduce NodeRegions for use in isUnreachableInCall.

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This commit is contained in:
Anders Schack-Mulligen
2024-04-25 15:36:26 +02:00
parent 486eaad566
commit bc8ca1af86
12 changed files with 142 additions and 31 deletions
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12
python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPrivate.qll
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@@ -1023,13 +1023,21 @@ predicate attributeClearStep(Node n, AttributeContent c) {
exists(PostUpdateNode post | post.getPreUpdateNode() = n | attributeStoreStep(_, c, post))
}
class NodeRegion instanceof Unit {
string toString() { result = "NodeRegion" }
predicate contains(Node n) { none() }
int totalOrder() { result = 1 }
}
//--------
// Fancy context-sensitive guards
//--------
/**
* Holds if the node `n` is unreachable when the call context is `call`.
* Holds if the nodes in `nr` are unreachable when the call context is `call`.
*/
predicate isUnreachableInCall(Node n, DataFlowCall call) { none() }
predicate isUnreachableInCall(NodeRegion nr, DataFlowCall call) { none() }
/**
* Holds if access paths with `c` at their head always should be tracked at high